记录Hadoop native libraries无法load的问题

nescafeboy1

　　今天遇到一个错误，在本地往Hadoop写文件的时候报了一个错误:
　　SequenceFile doesn't work with GzipCodec without native-hadoop code!
　　SequenceFile有个判断会抛出这个exception

private static Writer
createWriter(Configuration conf, FSDataOutputStream out,
Class keyClass, Class valClass, boolean compress, boolean blockCompress,
CompressionCodec codec, Metadata metadata)
throws IOException {
if (codec != null && (codec instanceof GzipCodec) &&
!NativeCodeLoader.isNativeCodeLoaded() &&
!ZlibFactory.isNativeZlibLoaded(conf)) {
throw new IllegalArgumentException("SequenceFile doesn't work with " +
"GzipCodec without native-hadoop code!");
}

　　通过这段代码可以测试这个错误。

import org.apache.hadoop.io.compress.zlib.ZlibCompressor;
public class MyTester {
public static void main(String[] args) {
new ZlibCompressor();
}
}

　　如何避免？
　　有两种解决方案：
　　1. 把hadoop.native.lib设置为false
　　2. 把/duitang/dist/sys/hadoop-1.2.1/lib/native/Linux-amd64-64/*下的so文件copy到/duitang/dist/sys/java/jre/lib/amd64